Today, the universal tuning standard for most musical instruments is a definite pitch with a hertz number of 440. This means that the vibrations of that pitch are oscillating at 440 cycles per second, or 440 Hz. In music, definite pitches such as this are called tones.
Agapeo: The Greek word that refers to the love of God, one of the kinds of love we are to have for people, is agape. Agape is the very nature of God, for God is love (1 John 4:7-12, 16). The big key to understanding agape is to realize that it can be known from the action it prompts.
One of the Greek words for love means to have a brotherly love towards someone. Another one of the Greek words means to have a passionate love towards someone. But the word used by John here, agapao (from the word agape), means something quite different. In some translations, agape is actually translated as charity. Agape then, can be described as self-giving love. It is this self-giving love that John is calling us to.